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实验与探究：三角点阵前n行的点数计算 如图是一个三角点阵，从上�下数有无数多行，其中第一行有1个点，第二行有2个点…第n行有n个点，容易�现 Template






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sketch 2899 Snoopy by Rhemzkian Esturco
sketch 4646 Panda by Raimundo Santos
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sketch 4305 Burka,
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sketch 3743 Just for fun
sketch 4306 The burning watermelon!
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sketch 1119 crimson
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sketch 3755 Panda by Roberto Castro Colimil
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